Question

I often doubt           .

A．that this song is worth listening to	B．if this song is worth listening
C．that this song is worth listening	D．if this song is worth listening to

Answer 1

B

本题的含义是我经常怀疑这首歌是否值得去听，if引导一般疑问句的宾语从句，表示是否的意思，be worth doing sth表示值得做某事，后面没有名词或代词，listen无需加to，故本题选B。